Automatic chuck



(No Model.) I

"C, M. OON'RADSON'.

AUTOMATIC CHUCK. No. 497,632. .Pa.tented May 16, 1893'.

UNITED MES ATSENTV Genres.

CONRAD M. OONRADSON, OF MADISON, VVISOONSIN.

AUTOMATIC CHUCK.

SPECIFICATION forming part of Letters Patent No. 497,632, dated May 16,1893.

Application filed November 28, 1892. Serial No. 453.422. (N model.)

To all uihgm. it may concern.-

Be it known that I, CONRAD M. CONRADSON, a citizen of the United States,residing at Madison, in the county of Dane and State of Wisconsin, haveinvented certain new and useful Improvements in Automatic Chucks, ofwhich the following is a specification.

My invention relates to automatic chucks, designed more particularly foruse in screw machines, but obviouslyapplicable to all classes and stylesof machines in which it is desired to clamp or to release the stockwhile the machine is running.

In the drawings,Figure 1 is a face view of a portion of a turret lathe,showing the is threaded externally at its outer end, and

mounted upon the threaded portionis a con1 bined gear Wheel and nut D.This nuthas-a collar 0 which bears against the outer faces of thecollets d; so that when the nut moves?" toward the headstock, the collarwill carry tlif collets into the conical s eat or; socketil pthei end ofthe spindle, andj byreason of th form of the socket, cause the colletsto bear and firmly grasp the rod or stock. j 1

In order to turn the vnut D first in one direction and then in theother, I providefthe arbor, or its disk a, with gear bands E and F, (theformer having fifty-nine teeth and the" latter sixty-one teeth) whichmesh with the gears G H (having respectively thirty-one and twenty-nineteeth) mounted loosely upon a hollow shaft I, as shown in Fig. 1.Secured uponshaft I, there is a pinion J (which has thirty teeth) toengage the pinion-nut Dhaving sixty teeth,the said shaft being supportedin a suitable framework or support K secured to the standards of themain frame.

The opposing faces of the gears G H are recessed to receive a clutch,which, in the pres- The arbor or spindle, I

out instance, is made in the form of a beveled disk L of rawhide,leather, or any 0th'er suit ble material. This disk or clutch isprevented from rotating independently of the hollow shaft I, by means ofa rod or stem. 6 which has near its inner end a pin f which worksthrough a slot inthe hollow shaft and engages the disk. In order to movethe rod lengthwise, I employ a lever M which is hinged or'pivoted inlugs g on the front face of the frame, and provided with studs h toengage a collar t onthe-rod.

Before proceeding to describe the operation of the device, I desire tostate that the proportions of the gears here given,are not such as arenow used in practice, but will serve'fto illustrate theprincipleinvolved.

Supposing the collet's to be closed upon stock or body Z, and it isdesired to release the stock, the lever M is pressed backward toward theheadstock and carries the rod or stem e'inward within the hollow shaftsufliciently far to throw the friction disk L into engagement with theloose gear H. Motion imparted-jto'the'arbor (which is assumed torotate"continuouslyyis transmitted through the gears. F and H and diskL, to the shaft I,

and from the'latter, to the gear nut D through the gear J. Owing to thedifference in the sizes of the gears thus brought into action, thegear-nut will be turned or rotated faster than its spindle or arbor andwill consequently beunscrewed from the latter. As soon as the collar chas been moved far ehough to release the collets cl, the lever M will bebrought back Itoan intermediate position where the disk L will notengage either of the gears G H, or the lever may be left alone, for whenthe gearnut screws 01f far enough to strike the frame yor casing K, theresistance offered to the rotation of the nut by the latter willovercome the friction of the disk L and cause the latter to slip. It isbetter, however, to bring the lever back to the medial position. If nowthe stock be fed forward in any suitable manner, the chuck may be closedupon it by throwing the lever M forward away from the headstock, thusbringing the friction disk or clutch L into engagement with the gearwheel G and thereby lockin g said wheel to the shaft I. Mo tion is nowtransmitted from the arbor or spindle through gears E, G, and disk L, tothe shaft I, and fronrthe latter to gear J and gearnut D. Owing to thedifference in the sizes of the gears thus brought into action, the gear11111; D will be retarded in its rotation and consequently screwed backupon the arbor. This action is continued until the chuck jaws or colletsclose down upon the stock with sufficient firmness to cause the disk orclutch L to slip in the gear G,the adjustment and arrangement of thisdisk being such as to cause the collets to give any desired grip to thestock before it (the clutch) slips. By this means thestock is grippedwith uniform press nre even of varying size. For holding stock ofdifferent cross-section and of greatly different size, suitable colletswill be employed.

Having thus described my invention, what I claim is 1. In combinationwith a rotating arbor, a chuck carried thereby, and ditferential gearingbetween the arbor and the jaw-actuating member of the chuck.

2. In combination with a rotating arbor, a chuck carried thereby, anddifferential gearing actuated by the arbor for imparting motion tothejaw-actuating member of the chuck.

3. In combination with the hollow arbor, threaded externally, andhavinga conical seat to receive the jaws; the single gear nut D to actupon the jaws; and gearing for actuating the gear nut in both directionsfrom the rotating arbor.

4. In combination with the hollow arbor, threaded externally, and havinga conical seat to receive the jaws; a gear-nut D to act upon the jaws;and differential gearing between the arbor and the gear-nut.

5. In combination with the hollow arbor, threaded externally, and havinga conical seat to receive the jaws; a gear nut D to act upon the jaw;diiferential gearing between the arbor and the gear-nut; and a frictionclutch forming a part of such gearing. v

6. In combination with the hollow arbor C, threaded externally, andprovided with a socket to receive the jaws c; a gear-nut D to act uponthe jaws; gears E and F carried by the arbor; a shaft I provided withfast gear J, and loose gears G and II; a friction clutch for connectingeither of the loose gears to the I shaft; and means for actuating theclutch.

7. In combination with the hollow arbor and the chuck carried thereby;gearing actuated by the arbor for moving the jaw-actuating member of thechuck; and a yielding device interposed between the said member and thearbor.

8. In combination with the hollow arbor provided with the gears E F, andthe jaws (I; the gear-nut D provided with collar 0; hollow shaft Iprovided with fast gear .I, loose gears G H, and friction disk L; rodeconnected with the disk; and a lever M connected with the rod.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

CONRAD M. CONRADSON.

\Vitnesses:

W. RI EAGLES, O. H. ALLYN.

